QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

3 km NNW of Loíza, Puerto Rico

· 87 km deep · released about 1,400 lb of TNT

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10 km30 km60 km120 km N Loíza Municipio 6 kmCarolina Municipio 11 kmRío Grande Municipio 14 kmCanóvanas Municipio 15 kmTrujillo Alto Municipio 19 kmSan Juan Municipio 19 kmLuquillo Municipio 22 kmGurabo Municipio 23 kmJuncos Municipio 27 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 3.1 (md)
Depth
87 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 6 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2257 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 1,400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 240,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,700× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× more

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 18.4643, -65.8913. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 6 km (4 mi) ENE of here earthquakes near Loíza Municipio
Carolina Municipio, PR 11 km (7 mi) NE of here earthquakes near Carolina Municipio
Río Grande Municipio, PR 14 km (9 mi) NW of here earthquakes near Río Grande Municipio
Canóvanas Municipio, PR 15 km (9 mi) N of here earthquakes near Canóvanas Municipio
Trujillo Alto Municipio, PR 19 km (12 mi) NE of here earthquakes near Trujillo Alto Municipio
San Juan Municipio, PR 19 km (12 mi) ENE of here earthquakes near San Juan Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

37 earthquakes have been recorded within 50 km since this one.

  1. 3.2 38 km N of San Juan, Puerto Rico
  2. 3.5 1 km ENE of Dorado, Puerto Rico
  3. 3.2 36 km NNE of Luquillo, Puerto Rico
  4. 3.0 5 km ESE of Cataño, Puerto Rico
  5. 2.8 1 km NW of Cidra, Puerto Rico
  6. 2.5 19 km N of San Juan, Puerto Rico
  7. 2.9 2 km NNE of Levittown, Puerto Rico
  8. 2.8 6 km N of Martorell, Puerto Rico
  9. 2.9 Puerto Rico region
  10. 2.0 4 km SSE of G. L. Garcia, Puerto Rico
  11. 2.2 1 km SW of H. Rivera Colon, Puerto Rico
  12. 2.9 23 km N of Loíza, Puerto Rico
  13. 3.4 0 km NE of Mucarabones, Puerto Rico
  14. 3.2 42 km NNE of Vieques, Puerto Rico
  15. 3.0 34 km N of San Juan, Puerto Rico

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.